Welcome from Ontario, Canada. Great quilt!
If the fabric was washed before you used it, then a gentle cold water wash should be fine. I put my quilts in the dryer to just damp and then block flat to dry to prevent stretching when hanging. If the fabrics were not washed, you might get some bleeding even in cold water wash. I would suggest throwing in a couple of colour catcher absorbing sheets but I don’t think you have them there? Since all the fabrics are dark on black, you may be okay with washing. Good Luck!